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6920090: G1: Disable ReduceInitialCardMarks at least until 6920109 is fixed

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G1 now answers "no" to the query can_elide_initializing_store_barrier() in the product build. A debug flag allows alternate behaviour in debug builds.

Reviewed-by: iveresov, tonyp
This commit is contained in:
Y. Srinivas Ramakrishna 2010-01-26 16:52:29 -08:00
parent e19600ac5d
commit 342a620a7f
3 changed files with 15 additions and 3 deletions
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3
hotspot/src/share/vm/gc_interface/collectedHeap.cpp
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@ -66,7 +66,8 @@ void CollectedHeap::pre_initialize() {
// Used for ReduceInitialCardMarks (when COMPILER2 is used);
// otherwise remains unused.
#ifdef COMPLER2
_defer_initial_card_mark = ReduceInitialCardMarks && (DeferInitialCardMark || card_mark_must_follow_store());
_defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers()
&& (DeferInitialCardMark || card_mark_must_follow_store());
#else
assert(_defer_initial_card_mark == false, "Who would set it?");
#endif